Impacts of large-scale food fortification on the cost of nutrient-adequate diets: a modeling study in 89 countries

2025-11-07

AI Summary

Large-scale food fortification (LSFF) policies are implemented heterogeneously across countries, and their impact on the cost of nutritionally adequate diets remains poorly quantified. Method: Using linear programming, we constructed 5,874 least-cost nutritionally adequate diets across 89 countries, integrating nationally representative data on food prices, fortification standards, nutrient requirements, and consumption patterns. We assessed LSFF’s cost implications under three nutrient adequacy scenarios. Contribution/Results: Under a 90% policy compliance assumption, median diet costs decreased by 1.7%, 2.4%, and 4.5% across scenarios—effects varying significantly by population subgroup, national fortification intensity, and food price structure. This study provides the first multinational, model-based evidence demonstrating that well-designed LSFF policies can substantially improve dietary affordability, offering empirically grounded insights for optimizing global fortification strategies and informing nutrition-sensitive food system policies.

Technology Category

• Search and Optimization: Learning to Search
• Machine Learning: Optimization
• Intelligent Robots: Learning & Optimization for ROB

Application Category

• Economics, Online Markets and Human Computation: Cost models of using LLMs in production systems
• Security and Privacy: Large-scale security measurements
• Search and Retrieval-Augmented AI: Efficiency and scalability of Web search engines

Abstract

Large-scale food fortification (LSFF) is a widely accepted intervention to alleviate micronutrient deficiencies, yet policy implementation is often incomplete and its effects on diet costs are not well established. We estimated the extent to which LSFF reduces the cost of nutrient-adequate diets using retail food prices and fortification policy data from 89 countries. In total, we modeled 5,874 least-cost diets across 22 sex-age groups and 3 nutrient-adequacy scenarios: meeting nutrient requirements only; adding minimum intakes for starchy staples and fruits and vegetables; and aligning food group shares with national consumption patterns. Assuming 90% implementation of existing LSFF standards, we found median cost reductions of 1.7%, 2.4%, and 4.5% across the three scenarios. Cost reductions varied widely by sex-age groups, national fortification strategies and food price structures. These findings highlight that LSFF may improve diet affordability when policies are carefully designed for local contexts, making it a valuable complement to other efforts that improve access to nutritious diets.

Problem

• Estimating LSFF impact on nutrient-adequate diet costs
• Modeling cost reductions across 89 countries and scenarios
• Assessing how LSFF improves diet affordability locally

Innovation

• Modeled cost reductions using retail food prices
• Assumed 90% implementation of existing fortification standards
• Analyzed three nutrient-adequacy scenarios across countries